Updated openstack/openstack
Project: openstack/ceilometer  70882f7cbeba48c35e4e261937bba1481e8dc6cf

Fix doc gate job false success

pbr config was missing from setup.cfg. With adding "warnerrors = true"
under '[pbr]' in setup.cfg, the Sphinx build will fail in case of
warnings and errors during the build process.

This patch also fixes the currently existing problems in the developer
documentation of Ceilometer. The unused todo extension was also removed.

Fixes-Bug: #1317648
Fixes-Bug: #1321193
Fixes-Bug: #1272845

Change-Id: If1a9d7aca5c1d350568a83fb49bb8ea3defefdca